Drilling metal parts for bed rail and center beam #4: final score 130 to 0

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Blog entry by MrLaughingbrook posted 04-22-2017 12:19 AM 1316 reads 0 times favorited 0 comments Add to Favorites Watch
« Part 3: Parallels and x/y vise Part 4 of Drilling metal parts for bed rail and center beam series no next part

Hobby time has been short lately, but I’ve progressed…

I’ve completed drilling, countersinking and taping, using the methodology of changing bits without moving the piece.

With the pieces all marked and mounted at the drill press:

I positioned at the general location using the laser:

Refined the positioning with magnifying glasses and centering pin using the x-y vise:

Added cutting oil and drilled the through holes for 11/64 inch (#8 screws) followed by countersink without moving the piece or, 1/16th pilot through both pieces of the t-beams, then repeat centering laser/pin location step for making No. 27 and 32 for screw clearance and thread taps in each part separately (doing the countersink or tap immediately following the hole).

Manually countersink to depth, checking fit between light cuts with a cut off screw. Here I’d like to improve with a procedure to zero then set mechanical depth stop.

Drill press belt disengaged to tap and establish a 90 degree threading, then finishing by hand… The t-beams screw together nicely:

A review of the cuttings indicate a proper feed, speed, and bit sharpness:

Complete success:
40×11/64 holes
40×82 degree countersinks
10×1/16 pilot holes
10 x No. 27 clearance holes
10×82 degree countersinks
10 x No. 32 tap holes
10×6-32 thread taps
130 successful cuts
0 pieces ruined, 0 unusable/ugly holes, 0 broken/dulled bits

Now off to powder coating shop…

-- MrLaughingbrook

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